As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2299, AFTER ENGINE START NR 1 HYDRAULIC QUANTITY CHANGED FROM 2.5 TO 2.1. MAINTENANCE CHECKED FOR AIR IN THE NR 1 HYDRUALIC SYSTEM IAW AMM 29-10-00-70-801. NO FLUCTUATION ON NR 1 HYDRAULIC QUANTITY NOTED. SERVICED NR 1 HYRAULIC SYSTEM AS REQUIRED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.